microblaze: Remove unused asm label

It is not used at all that's why remove it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/microblaze/cpu/start.S b/arch/microblaze/cpu/start.S
index 84c29e5..e0e3470 100644
--- a/arch/microblaze/cpu/start.S
+++ b/arch/microblaze/cpu/start.S
@@ -129,7 +129,7 @@
 	/* Flush cache before enable cache */
 	addik	r5, r0, 0
 	addik	r6, r0, XILINX_DCACHE_BYTE_SIZE
-flush:	bralid r15, flush_cache
+	bralid r15, flush_cache
 	nop
 
 	/* enable instruction and data cache */